A Novel Three-Dimensional Coordination Polymer, [Cd(bpym)_(0.5)(μ_(1,1)-N_3)(μ_(1,3)-N_3)]_n (bpym = 2,2'-bipyrimidine), Containing both End-on and End-to-end Azide Bridges

摘要

A new polymeric complex, [Cd(bpym)_(0.5)(N_3)_2]_n (bpym = 2,2'-bipyrimidine) has been synthesized and characterized by spectroscopic, elemental analyses and single crystal X-ray diffraction. The title compound crystallizes in the monoclinic system, space group P2_1/c, with chemical formula C_4H_3CdN_8, a = 7.6763(5), b = 13.1539(9), c = 7.9693(5) A, β = 109.988(1)°, and Z = 4. Structural determination reveals that the coordination environment of the cadmium atoms is distorted octahedral, consisting of two nitrogen donors of one bpym and four nitrogen donors of four azide ligands. The azide ligand acts as a bridging ligand with two different bridging modes, an end-on (μ_(1,1)-) and an end-to-end (μ_(1,3)-) coordination mode, linking the Cd~(II) ions to form a two-dimensional layer metal-organic framework (MOF), which get cross-linked by the bridges of bis-bidentate bpym ligands to form a novel 3D network.